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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05a5021c33fccb3c22d44a50b6a9b898e30890169c76d6ece95ffa9e0674b35e' 
  AND token = 'a3aUnBcmtpMZfe7U1Q/kZDXEoOsySkjUAw8/Hchr8j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}